Buggy code:
public class ResolvedMember extends Member implements AnnotatedElement , IHasPosition { public String [ ] parameterNames = null ; protected TypeX [ ] checkedExceptions = TypeX . NONE ; private Set annotationTypes = null ; private boolean isAnnotatedElsewhere = false ; protected int start ; protected int end ; protected ISourceContext sourceContext = null ; public ResolvedMember ( Kind kind , TypeX declaringType , int modifiers , TypeX returnType , String name , TypeX [ ] parameterTypes ) { } public ResolvedMember ( Kind kind , TypeX declaringType , int modifiers , TypeX returnType , String name , TypeX [ ] parameterTypes , TypeX [ ] checkedExceptions ) { } public ResolvedMember ( Kind kind , TypeX declaringType , int modifiers , String name , String signature ) { } public static final ResolvedMember [ ] NONE = new ResolvedMember [ 0 ] ; public final int getModifiers ( World world ) { } public final int getModifiers ( ) { } public final TypeX [ ] getExceptions ( World world ) { } public TypeX [ ] getExceptions ( ) { } public ShadowMunger getAssociatedShadowMunger ( ) { } public boolean isAjSynthetic ( ) { } public boolean hasAnnotations ( ) { } public boolean hasAnnotation ( TypeX ofType ) { } public ResolvedTypeX [ ] getAnnotationTypes ( ) { } public void setAnnotationTypes ( TypeX [ ] annotationtypes ) { } public void addAnnotation ( AnnotationX annotation ) { } public boolean isBridgeMethod ( ) { } public boolean isVarargsMethod ( ) { } public boolean isSynthetic ( ) { } public void write ( DataOutputStream s ) throws IOException { } public static void writeArray ( ResolvedMember [ ] members , DataOutputStream s ) throws IOException { } public static ResolvedMember readResolvedMember ( DataInputStream s , ISourceContext sourceContext ) throws IOException { } public static ResolvedMember [ ] readResolvedMemberArray ( DataInputStream s , ISourceContext context ) throws IOException { } public ResolvedMember resolve ( World world ) { } public ISourceContext getSourceContext ( World world ) { } public final String [ ] getParameterNames ( ) { } public final String [ ] getParameterNames ( World world ) { } public EffectiveSignatureAttribute getEffectiveSignature ( ) { } public ISourceLocation getSourceLocation ( ) { } public int getEnd ( ) { } public ISourceContext getSourceContext ( ) { } public int getStart ( ) { } public void setPosition ( int sourceStart , int sourceEnd ) { } public void setSourceContext ( ISourceContext sourceContext ) { } public boolean isAbstract ( ) { } public boolean isPublic ( ) { } public boolean isProtected ( ) { } public boolean isNative ( ) { } public boolean isDefault ( ) { } public boolean isVisible ( ResolvedTypeX fromType ) { } public void setCheckedExceptions ( TypeX [ ] checkedExceptions ) { } public void setAnnotatedElsewhere ( boolean b ) { } public boolean isAnnotatedElsewhere ( ) { } public TypeX getGenericReturnType ( ) { } public TypeX [ ] getGenericParameterTypes ( ) { } public ResolvedMember parameterizedWith ( TypeX [ ] typeParameters ) { } private TypeX parameterize ( TypeX aType , Map typeVariableMap ) { if ( aType instanceof TypeVariableReferenceType ) { String variableName = ( ( TypeVariableReferenceType ) ( aType ) ) . getTypeVariable ( ) . getName ( ) ; if ( ! ( typeVariableMap . containsKey ( variableName ) ) ) { <START_BUG> throw new IllegalStateException ( ( ( "Type<seq2seq4repair_space>variable<seq2seq4repair_space>" + variableName ) + "<seq2seq4repair_space>not<seq2seq4repair_space>bound<seq2seq4repair_space>in<seq2seq4repair_space>type<seq2seq4repair_space>map" ) ) ; <END_BUG> } return ( ( TypeX ) ( typeVariableMap . get ( variableName ) ) ) ; } else { return aType ; } } }

Fix:
return aType ;